/usr/include/gnuradio/fxpt_nco.h is in gnuradio-dev 3.7.9.1-2ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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/*
* Copyright 2002,2004,2013 Free Software Foundation, Inc.
*
* This file is part of GNU Radio
*
* GNU Radio is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3, or (at your option)
* any later version.
*
* GNU Radio is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNU Radio; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifndef INCLUDED_GR_FXPT_NCO_H
#define INCLUDED_GR_FXPT_NCO_H
#include <gnuradio/api.h>
#include <gnuradio/fxpt.h>
#include <gnuradio/gr_complex.h>
#include <stdint.h>
namespace gr {
/*!
* \brief Numerically Controlled Oscillator (NCO)
* \ingroup misc
*/
class /*GR_RUNTIME_API*/ fxpt_nco
{
uint32_t d_phase;
int32_t d_phase_inc;
public:
fxpt_nco() : d_phase(0), d_phase_inc(0) {}
~fxpt_nco() {}
// radians
void set_phase(float angle) {
d_phase = gr::fxpt::float_to_fixed(angle);
}
void adjust_phase(float delta_phase) {
d_phase += gr::fxpt::float_to_fixed(delta_phase);
}
// angle_rate is in radians / step
void set_freq(float angle_rate){
d_phase_inc = gr::fxpt::float_to_fixed(angle_rate);
}
// angle_rate is a delta in radians / step
void adjust_freq(float delta_angle_rate)
{
d_phase_inc += gr::fxpt::float_to_fixed(delta_angle_rate);
}
// increment current phase angle
void step()
{
d_phase += d_phase_inc;
}
void step(int n)
{
d_phase += d_phase_inc * n;
}
// units are radians / step
float get_phase() const { return gr::fxpt::fixed_to_float(d_phase); }
float get_freq() const { return gr::fxpt::fixed_to_float(d_phase_inc); }
// compute sin and cos for current phase angle
void sincos(float *sinx, float *cosx) const
{
*sinx = gr::fxpt::sin(d_phase);
*cosx = gr::fxpt::cos(d_phase);
}
// compute cos and sin for a block of phase angles
void sincos(gr_complex *output, int noutput_items, double ampl=1.0)
{
for(int i = 0; i < noutput_items; i++) {
output[i] = gr_complex(gr::fxpt::cos(d_phase) * ampl, gr::fxpt::sin(d_phase) * ampl);
step();
}
}
// compute sin for a block of phase angles
void sin(float *output, int noutput_items, double ampl=1.0)
{
for(int i = 0; i < noutput_items; i++) {
output[i] = (float)(gr::fxpt::sin(d_phase) * ampl);
step();
}
}
// compute cos for a block of phase angles
void cos(float *output, int noutput_items, double ampl=1.0)
{
for(int i = 0; i < noutput_items; i++) {
output[i] = (float)(gr::fxpt::cos(d_phase) * ampl);
step ();
}
}
// compute sin for a block of phase angles
void sin(short *output, int noutput_items, double ampl=1.0)
{
for(int i = 0; i < noutput_items; i++) {
output[i] = (short)(gr::fxpt::sin(d_phase) * ampl);
step();
}
}
// compute cos for a block of phase angles
void cos(short *output, int noutput_items, double ampl=1.0)
{
for(int i = 0; i < noutput_items; i++) {
output[i] = (short)(gr::fxpt::cos(d_phase) * ampl);
step();
}
}
// compute sin for a block of phase angles
void sin(int *output, int noutput_items, double ampl=1.0)
{
for(int i = 0; i < noutput_items; i++) {
output[i] = (int)(gr::fxpt::sin(d_phase) * ampl);
step();
}
}
// compute cos for a block of phase angles
void cos(int *output, int noutput_items, double ampl=1.0)
{
for(int i = 0; i < noutput_items; i++) {
output[i] = (int)(gr::fxpt::cos(d_phase) * ampl);
step();
}
}
// compute cos or sin for current phase angle
float cos() const { return gr::fxpt::cos(d_phase); }
float sin() const { return gr::fxpt::sin(d_phase); }
};
} /* namespace gr */
#endif /* INCLUDED_GR_FXPT_NCO_H */
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